WAEC Chemistry 2018 Objective — Question 12
Question 12 of 50 from the West African Examinations Council (WAEC) Chemistry 2018 Objective paper, with the correct answer and a full explanation.
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Consider the following equilibrium reaction: 2AB(g) + B₂(g) ⇌ 2AB₂(g) ΔH = −X kJmol⁻¹ the backward reaction will be favoured by
- A. a decrease in pressureCorrect
- B. an increase in pressure
- C. a decrease in temperature
- D. the introduction of a positive catalyst
Explanation
Since the backward reaction proceeds with an increase in volume (moles of gas), it is favoured by a decrease in pressure.
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